
6. PROTOCOL B B-63322EN-1/01
-42-
6.1
COMMUNICATION SYSTEM
The communication system can be in either of two settings, one in
which the CNC reset/alarm state is posted to the host and the other in
which it is not posted. When ETX (bit 3 of parameter No. 5000) is 1,
the system is in the setting in which the state is posted.
6.1.1
When the CNC Alarm/Reset is not Posted to the Host
1) When the remote buffer receives data
The remote buffer requests the host computer to send data.
(1) The remote buffer transmits the DC1 code.
(2) The host computer starts to transmit the DC3 code to the
remote buffer by the DC1 code.
(3) When the empty area of remote buffer area becomes the
value specified, the DC3 code is transmitted.
(4) The host computer should stop transmission to the remote
buffer by the DC3 code. The overrun value is specified
later.
(5) The remote buffer transmits the DC1 code when the
remainder of buffer data becomes less than the level
specified and requests the host computer to start
transmitting data.
(6) The host computer should start transmitting data again by
the DC1 code. The transmission data is a continuation of
previous data.
10 ms or more 100 ms or more
ER code
DC3DC1DC3DC1
Overrun
1 ms or more
ER (output)
RS (output)
SD (output)
RD (input)
DR (input)
CS (input)